Washboard.



E. M. WHITNEY. WASHBOARD.

APPLICATION rum: SEPT. 19, 1913.

1,124,985; Patented Jan. 12, 1915.

wizeaaes I m. 4% t 1712 ELISHA WHITNEY, or WINGHENDON, MASSACHUSETTS.

WASHBOARD.

Specification of LettersIPate'nt. t t a 12, 19 5 Application filed.September 19, 1913. Serial N 0. 790,701.

To all whom it may concern:

Be it knownthat' I, ELISHA M. WHITNEY, a citizen of the United States,residing at Winchendon, in the county of Worcester and State ofMassachusetts, have invented new and useful Improvements in Washboards,of which the following is a specification.

This invention relates to improvements in wash boards and it is directedmore particularly to the construction of the rubbing board.

The object of the invention is to-provide a rubbing board of strong andinexpensive construction which has suitably diiferentiated rubbingsurfaces of eflicient character. In furtherance of this object, therubbing board consists wholly of a single sheetof zinc or other suitablemetal having certain novel structural features whereby it has greatintrinsic strength so that no special bracing parts or added plies ofreinforcing material are required and whereby its two sides presenthighly eflicient and definitely differentiated rubbing surfaces.

The improved board, aside from being intrinsically inexpensive, may beeconomically manufactured, not only by reason of the absence of specialparts but also by reason of the facility-with which the rubbing surfacesmay be formed.

The invention is illustrated in the accom panying drawings wherein: I

Figure 1 is an elevation of a wash board having a rubbing board made inaccordance with the invention; Fig. 2 is a vertical sectional view ofthe rubbing board; Fig. 3 is a horizontal sectional view thereof on theline 33 of Fig. 2.

Similar characters of reference designate corresponding parts throughoutthe several views.

The rubbing board 1 is composed wholly of a single sheet of zinc orother suitable metal having its opposite sides formed to provide rubbingsurfaces A and B characterized essentially by transverse corrugationsand alternating grooves but differentiated from one another in that thecorrugations 2 of the surface A are relatively Sharp at their apices andthe grooves 3 of said surface are rounded while the corrugations 4 ofthe surface B are of regular curvature, being rounded and, hence,relatively Smooth at their apices and the grooves 5 of said surface Bhave sharply defined angles coinciding with the apices of thecorrugations 2. The corrugatlons 2 and 4 are arranged alternately andtheir concave faces present the grooves 5 and 3 respectively which formparts of the opposite rubbing surface. 'Both of the rubbing surfaces areprovided with indentations at right angles to, the corru-' gations andintersecting the apices of the v The indentations 6 and 7 should bearranged at somewhat frequent intervals and in order that thisarrangement may be advantageously carried out without any interferencewith the differentiation between the two surfaces and without suchsurface irregularity as might cause tearing of the clothes theindentations 6 which intersect the sharp corrugations 2 are, like saidcorrugations, narrow, and relatively sharp, while the indentations 7which intersect the rounded or smooth surface corrugations 4 arerelatively wide and shallow and not so sharp or clear in their outlineas the indentations 6.

From the foregoing description it will be apparent that the rubbingboard although comprising but a single sheet of metal is intrinsicallystrong and provides two'rubbing surfaces of distinctive character whichare as sharply differentiated from one another as in those constructionswherein two distinct sheets are used to provide the two rubbing surfacesor such surfaces are formed by molding opposite faces of a vitreousplate. v

Having fully described my invention, I claim A rubbing board whichcomprises as an the sheet defining grooves which are pre-' apices beingrelatively wide and less sharply l0 sented at the opposite side of thesheet defined than the other indentations. alternately between thecorrugations there- In testimony whereof I have hereunto set of, therubbing board also having indentamy hand in presence of two subscribingtions intersecting the apices of its corrugawitnesses.

tions, the indentations for the corrugations ELISI-IA M. WVHITNEY. withsharp apices being relatively narrow Witnesses:

and sharp and the indentations for the cor- W. W. GOODWIN,

rugations with round or smooth surfaced ORANGE WHITNEY.

Copies 02 this patent may be obtained for five cents each, by addressingthe Commissioner of ZPatents,

Washington, I). 0.?

